Key Takeaways
- Switching from polybags to shrink wrap keeps Amazon from measuring phantom dimensions, stopping the per-unit fee leak that compounds into real money at 8-figure volume.
- Running a steady weekly replenishment cadence and splitting shipments to Amazon’s five assigned regional facilities cuts days on hand, skips placement fees and gets inventory Prime-eligible weeks sooner.
Being able to get inventory into the Amazon FBA network quickly makes a big impact on your cashflow. For many sellers, inventory is one of the biggest assets that tie up cash.
If you aren’t making that inventory sellable quickly enough, the common fix is to order even more inventory, and tie up more cashflow by maxing out storage, to mitigate the long inbound and FC transfer times.
In this article, we’ll go over the best way to get your items from your warehouse or manufacturer to Prime-eligible on Amazon, as well as one hack to protect your account from unnecessary dimensional fees that eat margins! (spoiler: stop using polybags!)
A Glance at Amazon Operations
Amazon operates a vast and everchanging logistics network that is impossible to keep up with. Here are a few of the most recent changes to their policies that directly affect how you inbound goods.
Earlier this year, Amazon discontinued FBA prep, and Amazon Canada shortly followed suit. That means your items need to land in the FBA network perfectly compliant with their prep guidelines.
If you do send in items that don’t pass their requirements, there’s no more recourse to fix it. You’ll be hit with inbound defects that impact your overall account health score due to the noncompliance, or have the inventory potentially destroyed at your expense.
Another recent update is Amazon Warehousing and Distribution no longer accepts oversized goods. ASINs must be smaller than 18″ x 14″ x 8″ and weigh less than 20 lbs per unit, and box dimensions can’t exceed 50 lbs or 25″ on any side.
So if your inventory is larger, heavier, or you pack boxes that are all of the above, you won’t be able to use the AWD network. But chances are, even if you are selling standard items, AWD will shut down end of August due to capacity issues and you’ll be forced to leverage the FBA network.
With that in mind, let’s talk about how to plan out your Amazon inbound operations for speed, compliance, and resilience.
Understanding the Amazon Inbound Process
The standard inventory journey when you pay placement fees:
- Seller’s warehouse ->
- National Inbound Crossdock ->
- Regional Inbound Crossdock ->
- Localized Amazon fulfillment center
When sellers pay placement fees their products are checked in and received at a National Inbound Cross Dock Center. Here your products are “technically” sellable, but this is a gross misrepresentation of the product’s ability to sell, as it is not Prime eligible until it hits a localized Amazon fulfillment center.
When you elect to optimize your shipment and send to the five regional facilities Amazon is telling you to, you are able to often speed up receiving, bypass the longest period of FC transfer time, effectively getting your products Prime eligible faster. This allows you to run leaner, carry less inventory in storage, and strengthen your inventory management and replenishment motions.
The optimized process ZonPrep follows for Amazon inbounds, which eliminates placement fees:
- Seller’s warehouse ->
- ZonPrep ->
- Regional Inbound Crossdock ->
- Localized Amazon fulfillment center
ZonPrep ships 30+ trucks to Amazon’s regional fulfillment centers every day. Most of these are sent as floor loaded trailers with live unload appointments at Amazon, which reduces the time it takes for items to get into the Amazon FBA network, and most importantly Prime eligible and ready for sale.
3 Amazon Inbound Best Practices
1. Stop the revenue leak: shrink wrap, not polybags
Here’s the hack I promised in the intro. When your inventory checks in, Amazon measures it, and those measurements decide your fee tier. A polybag with slack in the sides or a loose flap on top measures bigger than the product inside it. If that extra half inch bumps your unit into the next size tier, you pay the higher fee on every unit, every order, for the life of the SKU.
That’s the part that stings. It’s not a one-time charge, it’s a leak. A few cents per unit sounds like nothing, but at 8-figure volume it compounds into real money every single month, and most sellers never catch it because the fee looks “normal” on the report.
Shrink wrap fixes this. The film conforms tightly to the product, so the dimensions Amazon measures are the product’s actual dimensions, nothing extra. You also get better protection in transit and tighter packing inside your master cartons, which likely lowers your freight cost per unit too. This is exactly why we run five fully automated shrink wrap lines at ZonPrep and don’t use polybags at all.
One caveat: some items still need a polybag, like soft goods or products with loose parts. For everything else, make the switch, then pull your size tier report a few weeks later and see what moved.
2. Get on a consistent replenishment schedule
Remember the problem from the top of this article? Slow inbound times push sellers to over-order, max out storage, and bury cash in inventory that isn’t selling yet. A consistent replenishment schedule is the way out of that cycle.
The idea is simple: your volume changes with the season, but your rhythm shouldn’t. When you ship on a steady weekly cadence, you’re sending larger, predictable shipments instead of reacting to a stockout with one giant panic order or smaller, more frequent shipments that cost a premium with SPD. Your days on hand come down, your storage fees come down, and your team stops firefighting.
A steady cadence also makes everything downstream work better. Your freight consolidation math gets easier, your receiving at Amazon gets smoother, and your forecasting actually means something because your inbound pipeline behaves the same way every week. We’ve watched brands take days on hand from 90 down into the low 70s on rhythm alone, without changing a single product. You do need the volume to run this play.
3. Run a split shipment strategy
When you create a shipment plan in Seller Central, Amazon gives you a choice: minimal shipment splits or optimized shipment splits. Minimal splits are the convenient option, and it’s the one most sellers default to. You send everything to one national cross dock, and Amazon handles the rest. The cost of that convenience is placement fees on every unit, plus the full FC transfer time before anything is Prime eligible. That transfer averages around 26 days, and in Q4 it can stretch far longer.
Optimized splits are Amazon’s preferred split option You split the shipment yourself and send directly to the regional facilities Amazon assigns, usually five of them. No placement fees, and you skip the longest leg of the FC transfer, so your products are Prime eligible and selling weeks sooner.
The tradeoff is real: five shipments instead of one means more freight to book, more appointments to chase, and more coordination for your ops team. The way to win that tradeoff is consolidation. Hold inventory until you can build a full floor-loaded truckload for each region, then send each truck direct with a live unload appointment. If you’re unable to achieve these volumes, look to partner with a consolidation specialist like ZonPrep. Our clients are able to send every FBA shipment into Amazon as a floor loaded FTL by leveraging our consolidation network. We send 30+ trucks a day into Amazon regionals with live unload appointments.
The Bottom Line
Amazon isn’t going to slow down the changes, and with FBA prep gone and AWD tightening up, the sellers who win Q4 will be the ones with a clean inbound playbook. Tighten your prep so nothing leaks on fees, get on a rhythm so your cash isn’t buried in storage, and split your shipments so your inventory is actually selling instead of sitting in transfer. Get those three right and your inbound operation stops being a cost center and starts being an edge.
Are you curious about how much better your Amazon inbound process could be? Request an Amazon Opportunity Analysis here.
Kayvon Nazarian is the CEO of ZonPrep, an Amazon focused supply chain partner with 600,000 sqft of operating space that helps Amazon sellers transform their FBA operations from a cost center into a competitive advantage. Kayvon is a former top seller on Amazon and built the “3PL he wished he had.” Kayvon is constantly looking for ways to give ZonPrep clients a competitive advantage, including ZonPrep’s strategic location. Kayvon is the sole owner at ZonPrep and has bootstrapped the company to number 225 in the Inc. 5000 as of 2026. Kayvon lives in Georgia with his good boy, (and ZonPrep mascot) Ace.